(698g) Influence of Die Designs on the Produced Nonwoven Webs in Melt Blowing Process
AIChE Annual Meeting
2014
2014 AIChE Annual Meeting
Materials Engineering and Sciences Division
Polymer Processing and Rheology
Thursday, November 20, 2014 - 2:15pm to 2:30pm
Melt blowing is a process in which polymer melt is extruded through a row of orifices while hot air jets simultaneously attenuate the extrudates and form microfibers. These microfibers lay down randomly on a collector and are subsequently collected as a nonwoven web. Industrial melt blowing processes typically use a traditional die design that dates to the 1950s, comprising a single row of polymer orifices and two narrow slots for air on each side. The conventional designs generate a typical orifice density in the range of 20 to 40 holes per linear inch. The present work centers on two novel die designs with two-dimensional (non-linear) orifice arrangements, leading to higher orifice density and potentially improved productivity. As a consequence of the two-dimensional nature of these new designs, the fiber spinning aerodynamics is quite different from conventional processes and high-speed visualization was employed to observe the fiber-air jet interaction. It was found that the near-field interactions of the fiber with the air were dramatically different from conventional one dimensional die system. In addition, it was found that the two-dimensional designs can be used to create helical fibers, with diameter similar to meltblown fibers (1-5 micron), directly from the melt.
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